Chuck



July 9, 1940V AjM. STONE-R CHUCK INVETOR /llJZo/Qr ri-Lg Y ATTORNEYS azcmszi rrr; Fries CHUCK Arthur Merrick Stoner, `West Hartford, Conn.,

assigner to The Jacobs Manufacturing Company, Hartford, Conn., a corporation of Connecticut Original application July 8, 1938, Serial No.

218,111. Divided and this application December 5, 1938, Serial No. 243,998 y 6 Claims.

This invention relates to improvements in chucks. j

Its object is to improve upon chucks of the type having a plurality of rotary tool engaging jaws `and to provide a simple construction which can be assembled easily.

Another object is to increase the utility of chucks of this kind by arranging its parts to occupy a minimum of space.

A still further object is to provide a cage-like structure in which the gripping, jaws and their supporting parts are uncovered and are open for inspection.

This application is a division of application .-,llserial 110,218,111, ined July s, 193s.

Referring to the drawing:

Fig. 1 is a side elevation with parts broken away to'show some parts in section, of a chuck which is made according to and embodies my invention; n

Fig. 2 is a sectional end elevation ci the chuck shown in Fig. 1, the section being taken on the section line of Fig. 1 looking in the direction of the arrows 2 2;

Fig. 3 is a sectional end elevation of the chucky shown in Fig. 1, the section being taken on the section line of Fig. l looking in the direction of the arrows 3-3; f

Fig. 4 is a rear end view of one of the gripping jaws;

Fig. 5 is a side elevation of the part shown' in Fig. 4; and

Fig. 6 is a side elevation partly in section of parts of my improved chuck, showing some of the parts in diferent relative positions and illustrating the way the parts of the chuck are assembled.

I0 designates the substantially cylindrical body of the chuck having a transverse face H. l2 is an arbor tapered to fit an axial hole in the body and adapted to t the driven socket of a machine ltool, such as a power drill. I3 is an annular 'groove near the rear end of the body in which is a spiral spring i9.

Three post holes il are drilled into the body from its outer face. These are equally spaced angularly and are at equal distances from the Vcentral axis of the body. Between them are tapped holes I8.

2U is a sleeve rotatably supported on the body (Cl. 279-33) o Posts 3B are iitted into and seated upon the bottoms of the holes l1. The outer end 33 of `each post is of reduced diameter and forms a shoulder 34.

Pinions 35 fit the posts 3@ rotatively. These "5 are in mesh with the teeth of the iiange 2l of sleeve 2li. They are ofv sufficient thickness to extend, when seated on the face Il of' body Ill, beyond the flange 2 l as shown at 36a in Fig. 1.

it designates the clamping jaws. These have 10 cylindrical bores 4l which fit the posts 30 with interposed rollers 42. Each jaw has a body with an eccentric portion d3 and spaced eccentric ribs M, terminating in sharp edges 45 from which they are under-cut on a curve t6 (Fig, 4),.back #1,5 to the body portion i3 which is nearest the axis of the bore All. The contour of the ribs 44 is alike on all of the jaws, but they are spaced diierently on each jaw, as shown in Fig. 1, so that their edges 45 can be moved together to a '20 common axis, as shown in Fig. 3.

From one end of each jaw, a row of crown teeth il projects. These are concentric with the bore M and their outer diameter is somewhat less than that of thez'body portion B3; When assem- 25 bled these teeth t between the parts 36a of the pinion teeth which extend above the 'rim teeth 2l as shown in Figs. l and 3. i l

5t is a cover plate which is pro-videdv with clearance holesv for the pinions 38 and the teeth .3.0 41. This lies on the front surface of the rim iiange in the space between it and the lower ends of the body portionst of the clamping jaws. This cover plate may also have a central boss 5l which extends to and rests upon the face 35 Il of the chuck b ody I. n

52 is a clamping plate having' perforations through which the ends 33 of the adjusting posts extend. This clamping plate rests on the shoulders 34 of the posts. It is held in place .40 by screws 53 which pass through it and into engagement with the threaded holes i8 in the body lll.

The teeth 4l are so positioned in relation to the teeth of pinions 38 that the edges 45 of the 545 ribs 4d of the clampingrjaws are approximately in the axis of the body l) when the sleeve is moved in relation to body It by spring i9 to its extreme position. This is shown in Fig. 3.

In Fig. 6 the posts 30 are shown positioned in `:50 the holes `I in body lll. In assembling the parts,

the sleeve 20 isislipped longitudinally over the body. In the lower part of Fig. 6 it is shown at 2BA as partially positioned. It is moved further until its toothed flange rests upon the face H, 1,55 asA shown in the upper part of Fig. 6. The cover plate is put in place by moving it from the position EDA (lower part ofFig. 6), up to'abutting relation with the end of sleeve 20 with its boss 5I resting on the face Il of body ID (upper part 60 of Fig. 6). Next, the pinions 36 are slipped over the posts 30, through the clearance holes in cover plate 50 and into engagement with the toothed flange 2|. The gripping jaws 40 with rollers 42 within them are then put on the posts and moved along the posts until the teeth of their crown gears mesh with the parts 36a of the pinions iwhich project through the cover plate 5U. In `this position the inner ends of rollers 42 rest upon the uncut hubs of pinions 36.

With the parts thus assembled, the clamping plate 52 is placed on the reduced end portions 33 of the posts and then held in place by the screws 53. This securely clamps the posts 30 in place and the plate 52 serves to hold the clamping jaws, rollers and pinions against longitudinal movement and through the clamping jaws and cover plate, the sleeve 20 is held on the body I0.

The cage-like structure formed by the posts 3U and screws 53 between the cover plate 5B and the clamping plate 52 is of thelsrnallest possible outside diameter necessary to support the clamping jaws; in fact, none of it extends beyond the outer parts of the jaws themselves. It has the further advantage of being an open structure so that extraneous material will not collect within it and the clamping jaws may be inserted readily. The cover plate keeps chips and other material out of the gears.

The chuck can be easily operated while in rotation. A slight pressure of the hand on the sleeve is suiiicient to move the jaws from their fully closed position shown in Fig. 3 toward their fully opened position. Then a tool is inserted and the hand released. The spring moves the jaws inwardly and the grip on the tool is instantaneous and self-tightening. If this release of the chuck while in rotation is not desired, the spring may be omitted.

Structural modifications may be made within the spirit and scope of this invention and I intend no limitations other than those imposed by the appended claims.

What I claim is:

1. A chuck comprising a body, a sleeve rotatively supported by the body, said sleeve having a ilange overlapping the end of the body, 'a gear on said sleeve, angularly spaced posts projecting from one end of the body, pinions rotatively mounted on the posts in mesh with said gear, clamping jaws rotatively mounted on the posts, one end of each of said jaws abutting the flange on the sleeve, non-rotative connections between the pinions and the jaws, a clamping plate on the posts for retaining the sleeve on the body and the pinions and clamping jaws on the posts, and screws between and parallel with the posts for attaching the clamping plate to the body.

2. A chuck comprising a body, a sleeve rotatively supported by the body, an internally toothed iiange on the sleeveoverlapping the end of the body, angularly spaced posts projecting from one end of the body, pinions rotatively mounted on the posts in mesh with said toothed flange, clamping jaws rotatively mounted on the posts, non-rotative connections between the pinions and the jaws, a clamping plate on the posts for retaining the pinions and clamping jaws on the posts, and screws between and parallel with the posts for attaching the clamping plate to the body.

3. A chuck comprising a body, a sleeve ro tatively supported by the body, an internally toothed flange on the sleeve overlapping the end of the body, angularly spaced posts projecting from one end of the body, pinions rotatively mounted on the posts in mesh with said toothed 6 ange, clamping jaws rotatively mounted on the posts, one end of each of said jaws overlying the flange on the sleeve, non-rotative connections between the pinions and the jaws, rollers interposed between the posts and the jaws abutting 10 the pinions, a clamping plate on the posts abutting the other end of each jaw for retaining the sleeve on the body, the rollers in contact with the pinions and the pinions and clamping jaws on the posts, and screws between and parallel with 15 the posts for attaching the clamping plate to the body.

4. A chuck comprising a body, a sleeve rotatively supported by the body, an internally toothed ange on the sleeve overlapping the 20 end of the body, angularly spaced posts projecting from one end of the body, pinions rotatively mounted on the posts in mesh with said toothed flange, a cover plate overlapping the slee've constructed with clearance holes for the pinions, "25 clamping jaws rotatively mounted on the posts and abutting said cover plate, non-rotative connections between the pinions and the jaws, a clamping plate on the posts for retaining the pinions and clamping jaws on the posts and for l'3'0 holding the cover plate against the sleeve, and screws between and parallel with the posts for attaching the clamping plate to the body.

5. A chuck comprising a body, a sleeve rotatively supported by the body, an internally (5"5 toothed flange on the sleeve overlapping the end of the body, a cover plate over said flange, angularly spaced posts projecting from one end of the body, the end portions of said posts being of reduced diameter and forming shoulders, f4() pinions rotatively mounted on the posts in mesh with said toothed flange, clamping jaws rotatively mounted on the posts one end of said jaws abutting the cover plate, non-rotative connections between the pinions and the jaws, a clamp- H455 ing plate on the reduced portions of the posts and abutting their shoulders and the other end of the jaws to retain the pinions and clamping jaws on the posts to hold the cover plate against the sleeve, and screws between and parallel with l5() the posts for attaching the clamping plate to the body.

6. A chuck comprising a body, a sleeve rotatably supported by the body, an internally toothed flange on the sleeve overlapping the end p55 of the body, angularly spaced posts projecting `from one end of the body, the end portions of said Vbetween the pinions and the jaws, a clamping ,g5

plate on the reduced end portions of the posts and abutting their shoulders for retaining the pinions and jaws on the posts and for holding the cover plate against the toothed flange, and screws between and parallel with the posts form) attaching the clamping plate to the body.

ARTHUR MERRICK STONER. 

